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Method for extracting fluoride ions in solution

A fluoride ion and extraction technology, applied in liquid solution solvent extraction, solvent extraction, separation methods and other directions, can solve the problems of increasing the operation process, unable to efficiently extract fluoride ions, increasing production costs, etc., to achieve high extraction rate, separation and extraction. Good effect and effective recycling effect

Active Publication Date: 2018-06-05
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, amines and phenols cannot efficiently extract fluoride ions as extraction agents, so multi-stage extraction is required during extraction, which increases the operation process and increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] For the extraction of sulfur and phosphorus mixed acid leaching solution of phosphate rock, the fluoride ion concentration of the phosphate rock leaching solution is 0.364g / L. The volume fraction of phosphoric acid monoester in the oil phase is 30%, and the volume fraction of polyorganosiloxane is 70%. The oil phase is mixed and allowed to stand for 5 minutes as an extractant. The extractant and the phosphate rock leaching solution were mixed in a volume ratio of 1:5, and then quickly stirred and extracted at 50°C for 60 minutes. According to the GB / T 1872-1995 fluoride ion selective electrode method, the extraction efficiency reached 94.6%.

Embodiment 2

[0031] For the extraction of fluorine-containing wastewater, the fluoride ion concentration in the fluorine-containing wastewater is 0.384g / L. The volume fraction of phosphoric acid monoester in the oil phase is 50%, and the volume fraction of polyorganosiloxane is 50%. The oil phase is mixed and allowed to stand for 6 minutes as an extractant. The extractant and the phosphate rock leaching solution were mixed according to a volume ratio of 1:5, and then rapidly stirred and extracted at 40°C for 40 minutes. According to the GB / T 1872-1995 fluoride ion selective electrode method, the extraction efficiency reached 97.8%.

Embodiment 3

[0033] For the extraction of sulfur and phosphorus mixed acid leaching solution of phosphate rock, the fluoride ion concentration of the phosphate rock leaching solution is 0.364g / L. The volume fraction of phosphoric acid monoester in the oil phase is 60%, and the volume fraction of polyorganosiloxane is 40%. The oil phase is mixed and allowed to stand for 7 minutes as an extractant. The extractant and the phosphate rock leaching solution were mixed in a volume ratio of 1:5, and then rapidly stirred and extracted at 60°C for 60 minutes. According to the GB / T 1872-1995 fluoride ion selective electrode method, the extraction efficiency reached 98.0%.

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Abstract

The invention discloses a method for extracting fluoride ions in a solution. The method comprises the following steps of 1) performing pretreatment on a solution to be extracted to obtain an A product; 2) mixing a phosphate ester organic solvent and a silicon-containing organic solvent to obtain a B product; and 3) adding the B product in the A product to perform extraction reaction. The method has the characteristics of good separation and extraction effect, good selectivity, more cleanness and lower cost and also has the characteristics of high extraction efficiency and simpleness in operation.

Description

Technical field [0001] The invention relates to a method for extracting fluoride ions, in particular to a method for extracting fluoride ions from a solution. Background technique [0002] Fluorine is a halogen chemical element, its chemical symbol is F, its atomic number is 9, and its molecular formula is F 2 . Because the atom is small and squeezes out 9 mutually repelling electrons, it is the most active among elemental non-metallic elements. It is a strong oxidant and fluorinating agent. It is extremely corrosive, highly toxic, or corrosive in the halogen family. The most sexual and toxic. However, its compounds are stable and widely used, such as the corrosion-resistant "King of Plastics" PTFE. Fluorine is an indispensable trace element in the human body, but because fluorine and some of its compounds are toxic and corrosive, once ingested in excess, it will cause serious harm to human health. Fluorine and its compounds can inhibit the catalytic function of enzymes. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04
CPCB01D11/04B01D11/0492
Inventor 陈前林左永辉
Owner GUIZHOU UNIV
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